@article{10_2140_agt_2003_3_993,
     author = {Tabachnikov, Serge},
     title = {On three-periodic trajectories of multi-dimensional dual billiards},
     journal = {Algebraic and Geometric Topology},
     pages = {993--1004},
     year = {2003},
     volume = {3},
     number = {2},
     doi = {10.2140/agt.2003.3.993},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2003.3.993/}
}